Upload ATmega4809 firmware via nano every programmer?

Development Platforms
1

I have taken over a project where a 4809 is used unfortunately the used UART\USB transceiver does not work in general with the 4809. My predecessor did use a nano every where he de-soldered the 4809 to flash the mcu. He used to build the firmware for the nano every. Then flashing the software works unfortunately not all pins are mapped with the nano every builds.

I would like to build for the 4809 and then flash the firmware using the nano every pcb till i have a fixed pcb. I tried to use the upload command for the nano every but that does unfortunately no work…

Any ideas how I could do that?

my platformio.ini

upload_flags =
-v
-p
atmega4809
-C
${platformio.packages_dir}/tool-avrdude/avrdude.conf
-c
jtag2updi
-Ufuse2:w:0x01:m
-Ufuse5:w:0xC9:m
-Ulock:w:0xC5:m
-b
115200
-V
-e
-D
-P
“COM7”
upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i

and verbose output

avrdude -v -p atmega4809 -C C:\Users\fbosholm.platformio\packages/tool-avrdude/avrdude.conf -c jtag2updi -Ufuse2:w:0x01:m -Ufuse5:w:0xC9:m -Ulock:w:0xC5:m -b 115200 -V -e -D -P “COM7” -U flash:w:.pio\build\ATmega4809\firmware.hex:i

avrdude: Version 7.1-arduino.1
Copyright the AVRDUDE authors;
see avrdude/AUTHORS at main · avrdudes/avrdude · GitHub

     System wide configuration file is C:\Users\fbosholm\.platformio\packages\tool-avrdude\avrdude.conf

     Using Port                    : COM7
     Using Programmer              : jtag2updi
     Overriding Baud Rate          : 115200

avrdude jtagmkII_getsync() warning: attempt 1 of 10: sign-on command: status -1